WordWeb Online

1. Lose validity
   "My passports expired last month";
   - run out
    
2. Cease to live; lose all bodily attributes and functions necessary to sustain life
   - die, decease [archaic], perish, go, exit, pass away, pass, kick the bucket [informal], cash in one's chips [informal], buy the farm [N. Amer, informal], conk [informal], give-up the ghost [informal], drop dead, pop off [informal], choke, croak [informal], snuff it [informal], flatline [informal], cop it [Brit, informal], cash in [informal], pop one's clogs [informal]
    
3. Expel air
   "expire when you lift the weight";
   - exhale, breathe out

Derived forms: expires, expired, expiring

See also: breathe

Type of: breathe, change state, discontinue, respire, suspire [literary], take a breath, turn

Encyclopedia: Expire